Unit 4

2. a place where you go buy stamps and send letters
5. a way of making electricity form, for example, wind, sun or water power
6. a very large, round rock in space that goes around the Sun, for example Earth or Mars
8. to make a place clean and without litter and pollution
10. soft, wet earth
13. a place for people to leave rubbish
16. a flat piece of glass that catches the sun's energy
18. paper and other rubbish on the ground
19. pond an area of water where ducks swim
20. a team of people who work together to make a TV show
22. the world around us
23. materials we can burn to make electricity, for example coal and oil
24. a thin piece of metal that goes round and round. There are springs in many machines.
25. a glass building where you can grow things
26. park a zoo where you can see animals outside, not just in cages

1. machines, computers and other equipment that we invent to do work for us
3. the energy we use to make machines work
4. a building on a river where water makes a large wheel go round to make a machine work
7. a long, thick piece of wood you use to hold up a roof
9. the office of the police in a town or city
11. to hurt something or do something bad to it
12. a window in the roof to let light in
14. a boat that uses the wind to move
15. something that makes water, air or land dirty
17. a container in the street where you throw away paper and other rubbish
21. a place where people swim, like a big bath